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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47403888bd8b0603eaf99e42267b85e7bda76fe4cb02ea23a4ff116bb694e715' 
  AND token = '07ITya91+jvPy0VUqd1OQOnBtAx0qswLv6I+ja8LkCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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