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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8cd98dc991d535743e379edce5ffdf68bc8b77103962fe80bf2f83bcf1279ba' 
  AND token = 'NR4h8dWw594taBBwH5FQcVRBkIray4Mj51fOEEKAofE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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