SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '537277526a6f57731199f182dd5eafbe3687371b4fdd1eeb3862a420210d6248' 
  AND token = 'AnZ5/w4ll4W91U2EY0jfPwJQv6LBLRyWblgRmer9/CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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