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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fab7fc6e3587812fa382632fe834cf12f53d5544e3413c472a8cd98fca5c51' 
  AND token = 'YdxO0HRqHtIT+E1qsijZS1lnslYID5V/NCoCIjBdA94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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