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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbac2a7d89d6b956e0912d0d489f6c6f21b12c4daf0688e3959672c158f5156' 
  AND token = 'Xy6+MLGxmhGE9G9fpe1Qqf4x27U5DWN+vR+GJtoyQYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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