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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c626ec1fa40b05eb5c7a3a9edb44f147bb22c88d680a7c1a3b2dd2bbc597e56' 
  AND token = 'zbF8DZKkY6P0RAPF+KjWS1PLimlstd0kH/9v3m+tK80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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