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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650e520f7e0691eae8b8a9c3079c1b4791776ad8905ca7c8d492ce9343462626' 
  AND token = 'jx7M8LeTRii4VQn5cV0WNHwAQVA7W6jlv7agDGVXDBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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