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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584b4ffa45c4226647c5c54ce2444fb30025393fc527bb00adbb51a0de0b9d55' 
  AND token = 'AhLJHcT/KFX2XIJzofo/r/PKl8ZU+HfU3mtSlPly4lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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