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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41009245f7b1b09d7677e941af8c0884732f7953795274670302071edcf5bb66' 
  AND token = 'DLqbrMYPIfy2JnVONDtCo38BnSsNXCTLLgwSPgxnvrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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