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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6e9d5863b48d4af908c4da79bd5744baf53afa56bec9792a2c43607235b3d0' 
  AND token = '1dKJobupk7q+fyMQ4JDpA/Pf0gQTenBGzCe8jktcpJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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