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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc287d4049a80ceb0cb0ec25334d35bc09ba1c778debd27f653359cc5292e57' 
  AND token = 'fV6sIVle4kk91Xpq5LCxu4QLLt1u0o53cIbF2GrbA4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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