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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0368526e83b2c5bccea6ae56945ff3af39f893bb094e807c45f7339b9e111195' 
  AND token = 'cng0w0euxLznh7PiEaElEwJ4rWqqkBnbBAkWRb7n3q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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