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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36f262c4116cc7276a538d0998a67ba01d2ffd5db15f9cad532634a4fd31bbc' 
  AND token = '+fcpRlYYdF7oI5KUpgxYccLUtEf3p+3vKhCuBKIGlUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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