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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7ec160860de73e02895bba31491a4928b46db6a5572fb0c674ecc71cb4bc93' 
  AND token = '78Kielj8hROSK1P6cC3pG5kclItRjXoq/d1aj1i44BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}