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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627fdc52e42df1dd5e618e75e262e20f8bf1aa4eef2c6ee0941588f6580854b5' 
  AND token = 'MNP4oXSz6leYGS8oU8EHt04F8CMODlD59ExpT7U/hBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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