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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11aab4921ac0c16aad3b6d40df614f2797a60ea7ae6a26e42d5792f8ca53ce5c' 
  AND token = 'zoBjuMbaB+Pylfi/lzD1nc1Aj8G0M+g+9K6NEuD5uug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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