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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33a1c34a60b820c3873e67dbad9e8b91faab3ff560b7612f0ff475ccf128883' 
  AND token = '6JoyDzYAV2ua5LfWHDcP9f0mT7wREu67uJ4FC9lsmmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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