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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd60180589f103c98606d4b8331b025126104c0ba2f2548026cbfb3762f2941b' 
  AND token = 'zI4PCLuSL2vitusCWiAo7l8CTsTCyo0siOXbPjvcNgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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