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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47612210732709237430159eefddcbc57a7c268cb4a8a8f8c59dd732acad964' 
  AND token = '249zkroJLueRr9aYOGSiPcns0KuAZfGMBQVJtGeR7wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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