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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a36f9b805f99011644a32003283739160fb61f00dab1f14a12d72ecc29e63b74' 
  AND token = 'hyYnfSRaSs6ZF5IVJyCVzxVMpCHKSf6tLD6GDkHmQ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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