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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca94fd106c27023a357d65d7959871b92e116559018302e0b689e212372e449e' 
  AND token = 'wIlEqlZwkrmU6rHCqhG2Y19wnTbTNghs3qDyTIlo4Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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