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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7000698256cc35fc8f229fdda15cec2ea77532dcf6dad43710366bcf70f8a7' 
  AND token = 'lTFoAnHB+HQTQzDgt1JRS9f+UxacNF26S+IGzgtpr5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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