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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08728ddb1a22d5470db34b654a607ec3303db4551c900db9e252d2a8ae2d6806' 
  AND token = 'cUKjm7r+6uJlcN2XQ+5akg6glmuXpM8U9mScV+fzYcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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