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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5e66b83f126be3558f5d5b95e0a4f284177c1f83744b062adaef71600d66f6' 
  AND token = 'HlWyWTweVnbtg2fdLb8sZhn2cKR65XqzXNnKeaX4NnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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