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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb113003b84bfdcc51150adad7c908262c27e26f705c8cc2d13579837b0e801' 
  AND token = 'sb3poEt9CAVYwkjKmCYv61/pwYzbAC0XZaddo+n02lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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