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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6116b0dc30da4ca94ad2a4cda41733447635bae5df7db2b48485c96683760a6' 
  AND token = '47GjZ6B6407OAHaGu4MXwuA7qXfC9BeGPO7PQF5nENY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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