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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11ea784f4e2c0b1e2b355dfc58d3a16ae1f63e74673ab1c8921268b03f75802' 
  AND token = '4nRLe0i4C5DK3OYNHlL7AKED08y1OLmqqoTpKo6I+Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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