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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0a4c050e9d0bc60552f52f08b06f08d97fb66f862c3acb0e990c8ecdf56279' 
  AND token = 'apa8LxvonZZlZV1UgbOKfmZlfdSQS7WvNlqNBdOHueI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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