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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38cc3cebdc5bf3b75798855587381fba22ebd3c3828130cc786b6b667fa2956' 
  AND token = 'NXDRs1OoIvTuDPBO8XGHLIQd555uETJHEZg6YbibBOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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