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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98d3a40016895bfc97e5d79a0c9a0c979160e836d88afe3f921de6e3efb8b4d' 
  AND token = 'rZFgIFymA9mGyVGX+CiEakDF7ZtLslyTQlqS/oHR21Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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