SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d3359b6928e0f84ea86572b99b8b878530f7b7a79692c67cc0b32a0a1964e7c' 
  AND token = 'gqXVAKhJhKX26G3a/aPKHKDLq+8W0SBbsSbvjVEweIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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