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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506f7ddd3f949563636bb561fbdf7a0bc51a24ca50d20c41d8d4e2223bcb9731' 
  AND token = 'NDI72OZv0lfXHN4so1LGo4FvYdWpAdtMsH2WSLhwr74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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