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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc054675c29489a5f5d40648a199ce6037714d8b323e1406ca315607cfbcb45d' 
  AND token = 'c4RxHQvEX/G0nThJJ4LeisLOLpXWSx/EIQWolcufX8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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