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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651218da7d1da771fff4eb98b5b31eebf3e85224f0b272b419c023d8110b0fd2' 
  AND token = '+qYLmkm6SHTRCobWfHtIS9hkUC/UVTof5hIk8IZdH1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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