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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e204b0d893bbb8b86445a22bec28abec09594dd356625e4e45f5e5580299073' 
  AND token = 'YvMyhvNfTqziqnuTZ/wTk0Uph6xqq59L2va1IPlD6D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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