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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decfa417b9d13b3e2519a8409da12dd9739d04144ed241316fd829fabfb5a984' 
  AND token = 'FzBMbN/hhd8h0Bi6CvAB4h+e24u8tZnSci3FPfq/Tak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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