Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c47567826069868112db4e68ca88d0217b2477ba8862777d1b04cf6ea27411' 
  AND token = '+ZOEHMBF6nqVobcohtPpqOfXbhJrLIid18kVsvrX1D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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