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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013523e5a116617d7be019a759819802aa38859c7b948656d3042aac64926aed' 
  AND token = 'peKFB4N6vkvOFcgJ4Kfw5htN7gHViRBHQ0OVhHpRWV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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