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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2d20d09a532b332ecc135f73b5bd0618167d9607465258043d6c24dd1e001f' 
  AND token = 'fiAV6IZ4mi74GS/hCqJOP3ZclKhciDTt0y7Vf7BYAjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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