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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2473b86dece608a7e3827eb76c3f0e0300ca8fe4a7947467e4a2e3e50d57613' 
  AND token = 'QwjP742FGa0+1je5/DLQelvRgKFsGfI9g8mearZK4Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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