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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0c5280fd89ba25418acbcacbbdf6d5ecaa26cc734ea31eea9f4560dec3b262' 
  AND token = '6eNowcV13Oz9UR2TcNgj8CamFf34k3oVdoScFDTZ4cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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