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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a42a94ca57578e6fd00188729aac4a51a8330d544f435bdecbc16bbbffa237e' 
  AND token = 'rn0pFEvHL85CmdwnrgAQT0HZ0bjadabYaRtaHi6x6Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00139

JSON explain

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