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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8170bb085a033b77d9222fecf220640a117562ea346b9b144ff30875ccc8c1d0' 
  AND token = 'lrL9i3hjjDxeZaUtfxiEAdBpoUJZEV/1oGLBxgoxb7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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