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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755c747f5bdbe416dce5a8b7d92dc5b686bf147ef9745c237388533f7b78e0ed' 
  AND token = 'xJqRS39/3MVWb3biJ0ZV0HZxZu7VQU8fjhHfHl92qiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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