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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b790f7dcca34c9497c9c18cbf7551ea8cfdaa1050bd0f1b34d7f4fac7501e0f' 
  AND token = 'NTvgwSvIqgQOunFRAX7oGFLgfgKzZDoU4482E03mdUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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