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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16d3a08f439558939405811aeebc4e3b9f4a4dc3e35b49639fd442ee7cd1358' 
  AND token = '4DpsSiEBt0cL2+aqFCwgv9nx/YJXaNLS8rLHDPuiowY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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