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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5f4094cd3cc3b35ee63a70520a6fadcc7e3b00cb81e49337bb659960953b30' 
  AND token = 'aEUCfMn8P6Tc+ciyMo8pWPxKuPWzHszgUXSwatbpOoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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