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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e55adacaaf923aebb07aebea7b18f96fb748754259c3a54f6a46c4f5fcd8e56' 
  AND token = 'mIXay1RN69pkMNG+REr94sMsofckyLE+yr/E29bSi2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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