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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc0c60291b9cc06ad87b0475b04e7b7a954eb3501df3c61b0a6fb6b3c638a13' 
  AND token = '1aEYFCPUZh7HoRDwaIzxMQ699KMRjyTnCZrwj8XdPxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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