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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903db3e98c5f2f82786c0133c646e8a414ad3cc28dc773fc26036c9d5bccddfc' 
  AND token = 'WFGTzZWFn8z6nKYXT9LicFGIGRj4kIhpmXK7Sexn7ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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