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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec964be29ae421deb751aadb4510fa6529c7ed27bd0d902964176e7ce9f7a04f' 
  AND token = 'hXfA4mi68pZWURFLHC+WJqAecRmie2XJ2vDAztRomc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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