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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6618f5a569fa1d7702de8cfdbf4524813c7e93d11acf5158b68e0ec824b199' 
  AND token = 'Dk/4f6hHpWF8yJhizVVf8o6+m8KsckxlFNtIpy3SPw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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